AWS IoT Policy Variables

AWS IoT defines policy variables that can be used in AWS IoT policies within the
resource or condition block. When a policy is evaluated, the policy variables
are replaced by actual values. For example, if a device connected to the AWS
IoT
message broker with a client ID of "100-234-3456", the iot:ClientId
policy variable would be replaced in the policy document by "100-234-3456". For
more information about policy variables, see IAM Policy
Variables and Multi-Value Conditions.